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A Review of State-of-the-Practice Equipment at the Plum Creek WWTP. By Tim Grotheer Plum Creek Wastewater Authority & Dave Oerke RTW Professional Engineers & Consultants, Inc. Presented at the 2002 Joint RMAWWA/RMWEA Annual Conference Steamboat Springs, CO. Presentation Outline.

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a review of state of the practice equipment at the plum creek wwtp

A Review of State-of-the-Practice Equipment at the Plum Creek WWTP

By

Tim Grotheer

Plum Creek Wastewater Authority

&

Dave Oerke

RTW Professional Engineers & Consultants, Inc.

Presented at the 2002

Joint RMAWWA/RMWEA Annual Conference

Steamboat Springs, CO

presentation outline
Presentation Outline
  • Quality Equipment
  • Process Flexibility
  • Strict Effluent Limits
  • Design Approach

Flexibility

pcwa project overview
PCWA Project Overview
  • EPA Award Winning WWTP
  • Expansion from 2.7 to 7.3 MGD
  • 2X to 3X Growth Expansion
  • Encroaching Development Near WWTP
  • Current Organic Load has been 133% of Design at Times
pcwa project overview cont
PCWA Project Overview Cont…
  • Regulatory Issues
    • Future Ammonia Limit <1.0 mg/l
    • Future Phosphorus Limit <0.13 mg/l
  • Downstream use of South Platte Water
  • Maximum Use of Existing Facilities
  • Effluent Reuse Potential
planned facilities
Planned Facilities
  • Three Oxidation Ditches and SecondaryClarifiers Capable of BNR
  • Alum Addition to:
    • Flocculating Secondary Clarifiers
    • Floc Basins prior to Tertiary Filters
  • Filtration & UV Disinfection
  • Biosolids Handling Facilities
  • Odor Control
  • Addition to the Administration Buildingand New Maintenance Building
planned facilities oxidation ditches
Planned Facilities – Oxidation Ditches
  • BNR with Anaerobic Selectors andAnoxic/Oxic Portions
  • Flexibility to Vary Detention Time UsingVertical Mixers with VFD Drives
automatic scada aeration control
Automatic SCADA Aeration Control
  • Blowers
    • Single – Stage Centrifuge
    • Unique Inlet/Outlet Vanes
    • 3-450 HP (includes 1 standby)
    • 1-450 HP Future
  • Significant Power Savings
  • Match Energy Consumption to:
    • Influent Flow
    • Dissolved Oxygen
    • ORP
  • Touch-Screen Control Panel
  • Greater Turndown to 30%
slide14

s i n g l e – s t a g e

m u l t i – s t a g e

p o s i t i v e d i s p

90

80

15%

70

30%

i s e n t r o p i c e f f i c i e n c y - %

60

t u r n d o w n l i m i t

50

w w t p

100

90

80

70

60

50

40

% c a p a c i t y

slide15

Peak 8360 ACFM476 HP

Potential Savings

254,040 HP / YR

$13,270/yr

@ $0.07/kW

$265,414 / 20 YR

Min 7840 ACFM447 HP

planned facilities uv disinfection
Planned Facilities – UV Disinfection
  • Ultraviolet Disinfection
    • State of the Art
    • Better Water Quality for Reuse
planned facilities filtration
As wastewater flows increase, phosphorus concentrations must decrease to continue to meet standards. Filtering the water will enable us to meet the standards and

Allow unrestricted reuse under Colorado regulations (on parks and open space)

Facilitates acceptance of augmentation plans

Planned Facilities - Filtration
planned facilities biosolids
Planned Facilities – Biosolids
  • Centrifuges dewater (remove water) from the biosolids
  • Less available land close in
planned facilities odor control
Planned Facilities – Odor Control
  • Encroaching development
  • Original Concept - Chemical Scrubbers
  • Selected Equipment – Ionization
design procedure to ensure quality equipment
Design Procedure to EnsureQuality Equipment
  • Interview Other WWTP Operators
    • Phone Interviews
  • Tours
    • Europe (Germany, Holland, and Great Britain)
    • United States (Florida, Arizona, and Colorado)
  • PCWA Staff Preferences
  • Input from RTW Engineers/Operators
design procedure to ensure quality equipment1
Design Procedure to EnsureQuality Equipment
  • 8 - Sole Source Specs
  • 18 Tight Specs Listing ONLY 2 Manufacturers
  • Challenging Substitution Requirements
  • Detailed Prequalification of General and I+C Contractors
project design considerations
Project Design Considerations
  • Cost Reductions:
      • Odor Control
      • Filters
      • Other
  • Phasing of Equipment to Accommodate Growth
  • Constructability Review and Value Engineering
potential users demands

Castle Pines NorthGolf Course

Other CastlePines Uses

Country ClubGolf Course

International

Golf Course

Plum

PCWAPlant #1

Creek

Woodlands

Interceptor

TheMeadows

FoundersVillage

x

PCWAPlant #2

(currentlyoff-line)

Red Hawk

Cedar HillCemetery

Downtown

DawsonRidge

Plum Creek

Potential Users & Demands
summary
Summary
  • Good Proven Equipment
  • More Streamlined Submittal Process
  • Easier Startup Process
  • Significant BNR Activated Sludge Process Flexibility
summary cont
Summary Cont…
  • Concrete Tank Savings with Deeper Tanks
  • Lower Power Consumption
  • High Quality Effluent
  • Good Odor Control
  • Team Effort